Bicycle frame



FIG. 1 is a right side elevation view of a bicycle frame showing our newdesign, it being understood that the broken lines are for illustrativepurposes only and form no part of the claimed design, the left side viewbeing a mirror image of that shown;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevation view thereof; and,

FIG. 6 is a rear elevation view thereof.

The ornamental design for a bicycle frame, as shown and described.